The local opposition claimed at a public planning appeal in Dorchester yesterday that developer Woodpecker had not discussed the controversial scheme sufficiently with the village's residents.
The residents are opposing the Jubilee Court scheme - by local firm Lionel Gregory - because of its scale and density.
But now they have claimed that both the Duchy of Cornwall and the developer refused to allow them a voice when the whole idea of extending the village first came up.
This could represent a massive embarrassment for the Prince, who has long argued that public consultation and so-called 'community architecture' should be the future of the profession.
'In the view of the residents, the only real community consultation for this whole scheme occurred in 1998 over a masterplan that held little more detail than a series of roman numerals,' the locals' lawyer Deborah Tripley said yesterday at the appeal.
'Since then there have been numerous masterplans relied on by the appellants [Woodpecker], none of which have been the subject of public consultation.'
Tripley said residents felt there had been 'insufficient consultation' on Jubilee Court. 'The residents have great concern that, if granted planning permission, this development will become a precedent for all future developments at Poundbury and elsewhere,' she added.